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Re: Index compression on Oracle 9.2

From: Jurijs Velikanovs <>
Date: Fri, 3 Feb 2006 00:06:55 +0000
Message-ID: <>

I agree with you.
In that case I would like emphasize the fact what many Oracle users think that compressed tables are the same (or almost the same) feature as compressed indexes.
I would say compressed table feature can be useful in 0.002% cases, at the same time compressed indexes would be good in 5% of cases. Any oracle feature (almost any) is made to improve thinks, not all can be useful often.

The same as with a LONIGGING tablespace option; In theory a great option on practise :(
However a direct path write useful more often then compressed tables.


On 2/2/06, Herring Dave - dherri <> wrote:
> > By my opinion the feature is absolutely grate (whilst table
> > compression is rubbish).
> Could you elaborate on the "rubbish" comment above? The reason I ask is
> that I've seen a pretty good compression percentage in the past at the
> table level. We had a bunch of tables as part of an initial build that
> we wanted around, but needed them to cough up some of the space (I think
> they were consuming 300 - 400GB of space). I rebuilt them using CTAS,
> ordering by the columns with cardinality < 50, up to 5 of them, in order
> by lowest cardinality to higher. Doing this the compression dropped the
> table sizes to around 60% of their original size. Table compression is
> pretty effective, in my experience, for this use.
> Dave
> -------------------------------------
> Dave Herring, DBA
> Acxiom Corporation
> 3333 Finley
> Downers Grove, IL 60515
> wk: 630.944.4762
> <>
> -------------------------------------
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Received on Thu Feb 02 2006 - 18:06:55 CST

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